Stereoselective Intramolecular [2+2] Trapping of 1,2‐Cyclohexadienes: a Route to Rigid, Angularly Fused Tricyclic Scaffolds
作者:Christian L. Jankovic、Kyle C. McIntosh、Verner A. Lofstrand、F. G. West
DOI:10.1002/chem.202301668
日期:2023.9.12
2-Cyclohexadienes generated under mild fluoride-mediated desilylative conditions undergo efficient intramolecular [2 + 2] trapping, providing tricyclic alkylidene cyclobutanes with complete diastereoselectivity for the cis-fused products. Pendent styrenes or electron-deficient olefins can trap simple 1,2-cyclohexadienes or their oxygenated counterparts, with 14 substrates being disclosed. Reactions proceed
在温和的氟化物介导的脱甲硅烷基化条件下生成的 1,2-环己二烯会经历有效的分子内 [2 + 2] 捕获,从而为顺式稠合产物提供具有完全非对映选择性的三环亚烷基环丁烷。侧链苯乙烯或缺电子烯烃可以捕获简单的 1,2-环己二烯或其含氧对应物,已公开了 14 种底物。仅使用氟化铯即可在环境温度下进行反应,产率高达 91%,并且可以从取代的 2-溴环己烯酮中轻松获得所需的前体。已经开发了多种合成路线来安装 [2 + 2] 捕获所需的适当官能团。